ultra-light clay
The features of ultra-light clay are easy painting, shaping, and environmental-friendly. It is very popular in Japan. It can mix colors. For example, if you need purple clay, you can mix blue and red clay. It is easy to operate. All works can be naturally air-drying without baking. It is suitable for making puppets, ornaments, simulated flowers.
stone clay
Stone clay is different from ultra-light clay. When it becomes dry, it is heavier than ultra-light clay. While, if you add into the water, the clay can be soft and flexible. It also can be a fixed shape for naturally air-drying without baking. It is suitable for making backgrounds in stop-motion animation.